i'm diana perez. >> and i'm john muller. this is my first official day as your new co-anchor here at "world news now." please don't throw tomatoes. i know i have big shoes to fill. make a little room for me in your heart. we'll win you over. thrilled to be here. >> a big welcome. so glad you are here with us. a familiar face for "world news now" you have filled in -- give us a rough estimate. >> dozens of times. weeks at a time. i have loved the show. i was a local anchor. being in the makeup seat at 4:00 in the morning, getting ready to do the show, always had "world news now" on. and they were the only people in town who were up earlier than us. and we really fell in love with the show. >> that's right. >> now i am on the show. the tradition on the show, the great people that have come through, rob, david muir, juju chang, anderson cooper. go on for hours. a thrill to be here. >> we have to give you your chops, a long-time anchorman. you know what you are doing. how long have you been doing this? >> a couple decades. yes,